Based on the background of a project survey,the characteristics and principles of the pre-drilled pressure test and the technical parameters of the"PY-4"type pre-drilled pressure test,through which the pressure test of the strongly weathered sandstone in the study area was carried out,and the physical and mechanical parameters and changes of the strong weathered sandstone,such as the initial pressure,the plastic pressure,the shear modulus and the side pressure modulus,were obtained.The results show that the shear modulus and 10.52 MPa at a depth of 13.5 m are 4.38 MPa and 10.52 MPa,respectively.The shear modulus and 13.95 MP at the depth of 22.5 m were 5.83 MPa and 13.95 MP,respectively.With the increase of depth,the shear modulus,the initial pressure and the plastic pressure of the strongly weathered sandstone all increase,and the increase of the shear modulus and the pressure of the pressure increases with depth,and the growth rate of the initial stress is larger than that of the plastic pressure.The strongly weathered sandstone in the study area shows good strength characteristics.
关键词
旁压试验/岩土工程勘察/旁压剪切模量/旁压模量/承载力特征值
Key words
side pressure test/geotechnical investigation/side pressure shear modulus/lateral compression modulus/characteristic values of bearing capacity
维普
万方数据